UnderSwap!Sans X Pregnant!Reader + Oneshots

Underswap!Sans X Pregnant!Reader 1

This one-shot contains smut/lemon in the beginning so if you're not comfortable with it, then please don't read. I just thought it would be cute to have Lil blue find out he's a dad and stuffs. This might have more than one parts to it for chapter lengths and for people who don't want to read the smut.

Sans has made tacos for dinner like he does almost every night. And, like every night, Papyrus was out at Grillby's probably bugging everyone with his jokes. The little skeleton had decided he wanted you to live with him so he could train you just like Alphys trains him. You had always thought it was so cute how much he cared for you. 

He sat down next to you and handed you your plate. You thanked him and took a bite. They were always too spicy or burnt, but edible. Happily, you took a bite as a lewd idea came across your mind. You smirked and looked over at the skeleton. 

Just as he was about to take a bite you placed your hand on his thigh and rubbed the bone with your thumb a bit. He blushed and looked over at you confused. "Human? What are you doing?" He asked you and put down the taco. He slyly shifted away.

You blushed, realizing he probably didn't know everything you did. The little skeleton seemed innocent enough after all. Then again... He was a skeleton. They probably didn't do intimate things together. 

"Shhh..." You placed a finger over his teeth and he looked into your eyes, you even more puzzled. He kept staring at you, trying to figure evrything out. You moved your hand up his thigh and stuck your tongue out at the little blue skeleton. 

"Human, you're making me feel weird..." He blushed and shivered, not knowing what to do. 

"It's okay," you reassured him. "Let's go to your room."

"Uh... Okay. But what about the tacos?" He asked and got up. 

"We'll have them in a little bit." You smiled and walked up to his room. Sans followed awkwardly. 

You pushed him onto his bed and crawled on his lap, facing him. He was about to protest, but you cut him off by pulling on the collar of his shirt and kissing him. His face heated up in surprise and he kissed back. Was it wrong to kiss something that wasn't human?

Eventually, you pulled away to see his reaction. He was looking up at you. At least, you thought he was. His sockets were empty as they were when he was serious. Your heart raced as you waited for him to say something. 

"Sans?" You quietly say his name. His pupils slowly fade into small little blue hearts as he looks into your eyes. 

"Wowie... Mweh heh..." His smile was as full as it would go. 

You giggled with him as he kissed you again. Sans' were more passionate. He wrapped his arms around your waist and yours around his neck. You pushed him down on his back, kissing him and breathing heavy. 

"You must really like me human!" Gasped the small blue skeleton. 

"You're right. I love you, Sans!" You laughed awkwardly. 

The flustered skeleton brought his hands to his face and squealed. "Well fear not human! I, the magnificent Sans also loves you!"

You chuckle and kiss him again. Slowly, you place a hand on his ribs over his shirt. You started to stroke your hands down and towards his pelvis but he arched his back and moaned as your hand moved along his ribs. 

He quickly covered his face. "So-sorry... I don't know what happened," said Sans, embarrassed. 

"Don't be sorry. Just tell me if I'm hurting you." 

You stroked his ribs. Up and down each one and circling around with your thumb. Sans was a moaning mess. He kept his arms near his face shyly but obviously enjoying your touch. A blue glow faded in through his shirt, shining through his bones from in his pants. He crossed his legs trying to cover himself, not exactly sure what was happening.

Slowly you kissed him down to his jaw and sucked on his neck. He clawed at your back in response. Even if he didn't fully understand what was going on, it still made him feel good. So he didn't want to stop. He never wanted this pure pleasure to end.

Sans tugged on your shirt when you started to kiss and nibble on his ribs. You lifted his shirt up to help you see what you were doing. He whined when you stopped to take off your own shirt. Your breasts were now exposed, making his jaw drop. His innocent eyes were big with amazement and lust and when they looked back into your own you could see his hunger for you.

With his eagerness in mind, you bit your lip in a tease and bent back over to continue. He shivered under your control and thrust against you. His bulge was now painfully hard. This made him growl quietly. 

"Beg," fully aware of his state, you ordered him. Though you weren't sure he understood. 

"P-please..." His breath hitched as he held back a moan. 

"What was that?" You teased. 

"Please!" He begged louder. He covered his face in embarrassment. 

You removed his hands and whispered by his skull. "Please what?"

Panting, he yelled at you, "Please make me feel good! Don't stop, (y/n)!"

A smirk grew across your face. You crawled off him then laid yourself between his legs. When you glanced up at him, his figure was breathing heavy. Something distracted you for a moment though, a blue tongue had made its way out his mouth and licked his top teeth then lolled out to one side a moment. That really got you excited. 

You rubbed the bulge from outside his pants then bit the edge of his pants, pulling them down. He almost shouted as he moaned loudly and bucked his hips. You giggled and grabbed his member at the base and rubbed him thoroughly. The fact that it was glowing blue and even there at all kind of surprised you at first, but you rolled along with it.

Sans gasped and held his breath. All of this was new to him, but he wasn't complaining. Why hasn't his brother told him about any of this? Was he just too lazy to tell him? Or maybe he didn't know either. Either way, he was sure there was a good reason. 

You decided you were done teasing him, and instead, you got up to completely undress. Once you got everything off, you climbed back on him. A warm hand caressed your left breast and made you slightly jump in surprise. You smiled at him and kissed him while you rubbed his ribs. He broke the kiss off with a loud moan. 

Carefully, you grabbed his member and positioned it at your entrance. He watched you curiously and eagerly. Then slowly you lowered yourself onto him. He covered his face as you both moaned. You were more than ready for this. The slight stretching only made you feel better. 

Slowly at first you bounced yourself up and down his length. Sans bit his finger trying not to be so loud. He liked the feeling but was slightly embarrassed of his reaction. When he looked up he loved what he saw. Human bodies weren't at all like the monster bodies. No fur, scales or fire. Just soft bouncy skin. 

You picked up your speed. Every moment was pure pleasure running through you. A bubbling-like sensation was felt in your lower stomach. That meant you were close. Sans was now moaning quieter than before.

Then you felt it. Sans moaned loudly and started to breath harder. He grabbed the pillow from under him and covered his face. Almost at the same time, you came on him, your orgasm long and loud. You got off and put your underwear and bra back on, panting hard and still feeling the throbbing pleasure from your womanhood. 

Sans pulled you down next to him. "I'm tired (Y/N), take a nap with me!" You agreed and rest your head on his ribs. They were surprisingly comfortable. 

Light started to shine even brighter than before. Out of curiosity, you peaked under the blankets and saw his soul. Usually souls only show up when you were in a fight. Or so you thought. Sans was already sleeping. You knew for sure from his 'Mweheheh' snores. 

Trying not to wake him up, you grabbed his soul and examined it. Then your soul appeared, floating up out of your chest. Almost immediately, yours brushed against his, red and white light making the room a lovely shade of pink. An electric shock zapped through your arms and down to your stomach, scaring you half to death. 

Almost as soon as it came, the pain was gone. You figured that maybe the souls just aren't supposed to touch. So you shrugged it off and cuddled back over to Sans.